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Metallurgical Transactions B

, Volume 18, Issue 3, pp 565–575 | Cite as

Liquid separation effects in Fe−Cu alloys solidified under different cooling rates

  • A. Munitz
Physical Chemistry

Abstract

The effect of cooling rates on the microstructure of Fe−Cu alloys was investigated. A variety of solidification techniques was employed, in order to obtain a wide range of cooling rates. At high cooling rates (about 104 K/sec), and in the composition range 30 to 80 wt pct Cu, the microstructures showed clear evidence of metastable liquid separation. This indicates a melt supercooling of about 50 to 100 K. Liquid separation coupled with high interfacial velocities resulted in solute trapping, and in a spherical morphology for one of the solids. At cooling rates lower than 104 K/sec no liquid separation was observed, and the alloys solidified in a conventional manner,i.e., with a polycrystalline or a dendritic microstructure, depending on the Cu content. The type of the γ-Fe to α-Fe solid state transformation, taking place during cooling after solidification, depends on the cooling rates as well as on the Cu content in the γ-Fe phase. At medium cooling rates the transformation is martensitic, while at low or high cooling rates a polycrystalline transformed structure is obtained.

Keywords

Cool Rate Metallurgical Transaction High Cool Rate Molten Pool Secondary Electron Image 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© The Metallurgical Society and ASM INTERNATIONAL 1987

Authors and Affiliations

  • A. Munitz
    • 1
  1. 1.Nuclear Research Center-NegevBeer-ShevaIsrael

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